xref: /illumos-gate/usr/src/lib/libnsl/rpc/rpcdname.c (revision 61961e0f)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 
23 /*
24  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
25  * Use is subject to license terms.
26  */
27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29 /*
30  * Portions of this source code were derived from Berkeley
31  * 4.3 BSD under license from the Regents of the University of
32  * California.
33  */
34 
35 #pragma ident	"%Z%%M%	%I%	%E% SMI"
36 
37 /*
38  * rpcdname.c
39  * Gets the default domain name
40  */
41 #include "mt.h"
42 #include "rpc_mt.h"
43 #include <sys/types.h>
44 #include <sys/time.h>
45 #include <string.h>
46 #include <syslog.h>
47 
48 extern int getdomainname();
49 extern char *strdup();
50 static char *default_domain = 0;
51 
52 static char *
get_default_domain(void)53 get_default_domain(void)
54 {
55 	char temp[256];
56 	extern mutex_t dname_lock;
57 
58 /* VARIABLES PROTECTED BY dname_lock: default_domain */
59 
60 	(void) mutex_lock(&dname_lock);
61 	if (default_domain) {
62 		(void) mutex_unlock(&dname_lock);
63 		return (default_domain);
64 	}
65 	if (getdomainname(temp, (size_t)sizeof (temp)) < 0) {
66 		(void) mutex_unlock(&dname_lock);
67 		return (0);
68 	}
69 	if ((int)strlen(temp) > 0) {
70 		default_domain = strdup(temp);
71 		if (default_domain == NULL) {
72 			syslog(LOG_ERR, "get_default_domain : strdup failed.");
73 			(void) mutex_unlock(&dname_lock);
74 			return (0);
75 		}
76 	}
77 	(void) mutex_unlock(&dname_lock);
78 	return (default_domain);
79 }
80 
81 /*
82  * This is a wrapper for the system call getdomainname which returns a
83  * ypclnt.h error code in the failure case.  It also checks to see that
84  * the domain name is non-null, knowing that the null string is going to
85  * get rejected elsewhere in the yp client package.
86  */
87 int
__rpc_get_default_domain(char ** domain)88 __rpc_get_default_domain(char **domain)
89 {
90 	if ((*domain = get_default_domain()) != 0)
91 		return (0);
92 	return (-1);
93 }
94